Fix the QOS test failure when packet sent are greater than 4K in size (…

…#10052)

What I did:

Fix the QOS test failure when packet sent are greater than 4K in size
Why I did:

    Increased socket buffer for PTF while running QoS test
    as we are sending packet > 4k in some cases where there is HBM involved
    to fill the buffer faster.

How I verify:
Test passing after making this change.

Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>

tests/qos/qos_sai_base.py

@@ -132,6 +132,7 @@ def runPtfTest(self, ptfhost, testCase='', testParams={}, relax=False):
             is_python3=True,
             relax=relax,
             timeout=1200,
+            socket_recv_size=16384,
             custom_options=custom_options
         )